Patent · US Expired

Preparation of 1-amino-2-chloro-4-hydroxyanthraquinone

US4997960A · kind A · utility

1Cited by

1References

9Claims

0Family size

Assignee

BASF SE

Inventor

Gerhard Epple · Bad Dürkheim, DE

Key dates

Filing date	Sep 7, 1989
Grant date	Mar 5, 1991
Priority date	—
Expiry date	Sep 7, 2009

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09B1/503
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

1-Amino-2-chloro-4-hydroxyanthraquinone (I) ##STR1## in prepared by chlorinating 1-amino-4-hydroxyanthraquinone (II) ##STR2## by a process in which the chlorination is carried out in 90-100% strength by weight sulfuric acid or in not more than 2% strength by weight oleum.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.